Leung Chun-ying is urged to declare all stock interests

Leung Chun-ying has been urged to declare all his links to his former property business no matter how small.

The call for the chief executive to adopt a "whiter than white" policy came after new media revelations that Leung has share options in surveying giant DTZ Holdings, of which he was once Asia-Pacific chairman.

The options, confirmed by Leung's office after the reports were published, are held through British Virgin Islands company Wintrack Worldwide, in addition to a "foreign branch" of DTZ reported earlier.

The discovery highlighted a grey area in the system of Executive Councillors' interest declarations, as it is not clear under the rules if stock options should be made public.

Under existing practice, an Exco member should declare a beneficial interest in shareholdings of a nominal value greater than 1 per cent of a company's issued share capital. It is debatable whether stock options that have not been exercised should be seen as a beneficial interest.

Leung has also yet to confirm whether the 643,514 DTZ stock options he holds are more than 1 per cent. According to a company notice issued in October last year, obtained from the London Stock Exchange, Leung was granted share options of 165,000 and 478,514 at nil exercise price in 2009 and 2010 respectively.